Sarcasm can express our expectations as well as our disappointments.

Studies revealed that exposure to sarcasm enhances problem-solving. It appears to stimulate complex thinking.

Not everyone thinks sarcasm is funny. There is also not just one way to be sarcastic. Sarcasm can be implied with pitch, tone, volume, pauses, duration, and punctuation.

The inability to understand sarcasm may be a warning sign of brain conditions.

You say something you don't literally mean, and the hearer only understands if they get that you're insincere. The ability to recognize sarcasm is an essential skill to function in a modern society that thrives on irony.